For a light incident from air on a slab of refractive index 2, the maximum possible angle of refraction is:

1. \(30^{\circ}\) 2. \(45^{\circ}\)
3. \(60^{\circ}\) 4. \(90^{\circ}\)

Subtopic:  Refraction at Plane Surface |
 58%
From NCERT
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A man with hypermetropia cannot see objects closer than a distance of \(40~\text{cm}\) from the eye. The power of the lens required so that he can see objects at \(25~\text{cm}\) from the eye is:
1. \(+4.5~\text{D}\)
2. \(+4.0~\text{D}\)
3. \(+1.5~\text{D}\)
4. \(+3.0~\text{D}\)

Subtopic:  Human Eye |
 74%
From NCERT
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A \(4.5~\text{cm}\) needle is placed \(12~\text{cm}\) away from a convex mirror of focal length \(15~\text{cm}\). What is the magnification?
1. \(0.5\)
2. \(0.56\)
3. \(0.45\)
4. \(0.15\)

Subtopic:  Reflection at Spherical Surface |
 69%
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Light of wavelength 5000 Å falls on a plane reflecting surface. For what angle of incidence is the reflected ray normal to the incident ray?
1. \(37^{\circ}\)
2. \(45^{\circ}\)
3.
\(90^{\circ}\)
4. \(0^{\circ}\)

Subtopic:  Reflection at Plane Surface |
 66%
From NCERT
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A concave mirror of focal length \(f\) produces an image \(n\) times the size of the object. If the image is real, then the distance of the object from the mirror is:
1. \((n-1)f\)
2. \(\frac{(n-1)}{n}f\)
3. \(\frac{(n+1)}{n}f\)
4. \((n+1)f\)

Subtopic:  Reflection at Spherical Surface |
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A concave mirror gives an image three times as large as the object placed at a distance of 20 cm from it. For the image to be real, the focal length should be:

1. 10 cm 2. 15 cm
3. 20 cm 4. 30 cm
Subtopic:  Reflection at Spherical Surface |
 61%
From NCERT
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A plane mirror is placed horizontally inside water (μ=4/3). A ray falls normally on it. Then the mirror is rotated through an angle \(\theta\). The minimum value of \(\theta\) for which the ray does not come out of the water surface is:
           

1. π4

2. sin-134

3. 12sin-134

4. 2sin-134

Subtopic:  Total Internal Reflection |
From NCERT
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In an astronomical telescope, the focal length of the objective lens is 100 cm and of the eyepiece is 2 cm. The magnifying power of the telescope for the normal eye is:

1. 50

2. 10

3. 100

4. 150

Subtopic:  Telescope |
 88%
From NCERT
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The magnifying power of a telescope is 9. When it is adjusted for parallel rays the distance between the objective and eyepiece is 20 cm. The focal lengths of lenses are:

1. 10 cm, 10 cm

2. 15 cm, 5 cm

3. 18 cm, 2 cm

4. 11 cm, 9 cm

Subtopic:  Telescope |
 85%
From NCERT
AIPMT - 2012
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A concave mirror of the focal length f1 is placed at a distance of d from a convex lens of focal length f2. A beam of light coming from infinity and falling on this convex lens-concave mirror combination returns to infinity. The distance d must be equal to:

1. f1+f2

2. -f1+f2

3. 2f1+f2

4. -2f1+f2

Subtopic:  Refraction at Curved Surface |
From NCERT
AIPMT - 2012
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